检索结果-南通市图书馆

基于风速波动幅度动态划分区间的ISSA-BP风电功率预测

在线全文

学校读者我要写书评

暂无评论

邵阳学院学报（自然科学版） 2024年第1期21卷 1-9页

作者：唐杰刘琳刘白杨邵武管烨易资兴邵阳学院多电源地区电网运行与控制湖南省重点实验室湖南邵阳422000

为了解决传统风电功率预测精度不高的问题,采用一种基于风速波动幅度动态划分区间的风电功率组合预测方法。首先,对清洗后的风速数据进行卡尔曼滤波得到去噪后的风速曲线图,计算该曲线中相邻元素的差值向量并归一化处理,完成风速波动幅... 详细信息

为了解决传统风电功率预测精度不高的问题,采用一种基于风速波动幅度动态划分区间的风电功率组合预测方法。首先,对清洗后的风速数据进行卡尔曼滤波得到去噪后的风速曲线图,计算该曲线中相邻元素的差值向量并归一化处理,完成风速波动幅度的可视化分析,依据波动幅度曲线的第一、二、三时间点将全年数据动态划分为4个区间;其次,利用Tent混沌映射算法初始化麻雀种群位置得到改进麻雀搜索算法(improvement sparrow search algorithm,ISSA),对误差反向传播算法(back propagation,BP)的连接权和阈值进行优化,建立ISSA-BP风电功率组合预测模型;最后,运用MATLAB仿真软件进行仿真验证。仿真结果表明,动态划分区间的ISSA-BP风电功率预测方法能显著提高预测精度,对提高电力系统经济运行水平,促进风电消纳具有一定的理论实际意义。

关键词：改进麻雀搜索算法反向传播算法卡尔曼滤波风电功率预测

Numerical analysis on zone-divided deep excavation in soft clays using a new small strain elasto–plastic constitutive model

在线全文

学校读者我要写书评

暂无评论

Underground Space 2022年第1期7卷 19-36页

作者： Afnan Younis Tanoli Bin Yan Yong-lin Xiong guan-lin ye Usama Khalid Zhong-hua Xu Department of Civil Engineering State Key Laboratory of Ocean Engineering and ShanghaiKey Laboratory for Digital Maintenance of Buildings and InfrastructureShanghai Jiao Tong UniversityShanghai 200240China Institute of Geotechnical Engineering Ningbo UniversityNingbo 315211China Department of Civil Engineering Khwaja Fareed University of Engineering and Information TechnologyRahim Yar Khan 64200Pakistan East China Architectural Design&Research Institute Shanghai 200002China

Accurate prediction of displacements associated with deep excavations is essential to ensure safety and stability of the excavation and to prevent any damage and distress to the adjoining *** paper presents a numerical approach for prediction of ground displacements related to a zone-divided deep excavation construction executed in Shanghai soft clays based on a new elasto–plastic con-stitutive model(small-strain Shanghai model)that incorporates small strain *** model can describe the mechanical properties and structural and over-consolidated characteristics of natural *** model is implemented into a finite element analysis *** analysis on the deep excavation in Shanghai using zone-divided method is conducted.A comparison between monitored and simulated results of horizontal displacements along the diaphragm wall,the settlements in the surroundings,and the effects on the adjoin-ing metro tunnel due to excavation construction is carried *** attention is paid to the stiffness degradation of representative elements in the *** simulated displacements show a good agreement with the monitored ***,this study provides an integrated solution for predicting displacements related to deep excavation in soft clays.

关键词： Deep excavation Soft clays Small strain Elasto-plastic model Ground displacements Metro tunnels

Investigation of the overconsolidation and structural behavior of Shanghai clays by element testing and constitutive modeling

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Underground Space 2016年第1期1卷 62-77页

作者： guan-lin ye Bin ye Department of Civil Engineering and State Key Laboratory of Ocean Engineering Shanghai Jiao Tong UniversityShanghai 200240China Department of Geotechnical Engineering Tongji UniversityShanghai 200092China

The mechanical properties and constitutive modeling of Shanghai clays are very important for numerical analysis on geotechnical engineering in Shanghai,where continuous layers of soft clays run 30-40 m *** clays are divided into 5 major layers.A series of laboratory tests are carried out to investigate their mechanical *** top and bottom layers are overconsolidated hard clays,and the middle layers are normally consolidated or lightly overconsolidated sensitive marine clays.A constitutive model,which can describe the overconsolidation and structure of soils using only 8 parameters,is modified to simulate the test results.A rational procedure to determine the values of the material parameters and initial conditions is also *** model is able to effectively reproduce both one-dimensional(1D)consolidation and drained/undrained triaxial test results of Shanghai clays,with one set of parameters for each *** element testing and constitutive modeling,two findings are ***,the decay rates of overconsolidation are smaller in overconsolidated layers than in normally consolidated ***,the natural microstructure of layer 4 is relatively stable,that is,a large degree of structure is still maintained in the specimen even after 1D consolidation and drained triaxial *** modified model and obtained parameter values can be used for numerical analysis of geotechnical projects in Shanghai.

关键词： Shanghai clays Laboratory tests Constitutive model Overconsolidation Structure

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

供电系统避雷器故障检测与自动切换系统设计

湖南电力 2024年第2期44卷 141-147页

作者：管烨刘白杨马随鹏冯晓明刘晓欣邵阳学院电气工程学院湖南邵阳422000 南方电网产业投资集团有限责任公司广东广州510000

针对供电系统中避雷器容易损坏且人工运维困难的问题,提出一种新型供电系统避雷器故障检测与自动切换方法。该方法利用快速傅里叶变换实时检测电流,利用微控制器进行数据分析并发出控制信号,实现在线检测避雷器故障。通过设计的自动切... 详细信息

针对供电系统中避雷器容易损坏且人工运维困难的问题,提出一种新型供电系统避雷器故障检测与自动切换方法。该方法利用快速傅里叶变换实时检测电流,利用微控制器进行数据分析并发出控制信号,实现在线检测避雷器故障。通过设计的自动切换避雷器机械结构,可实现备用避雷器逐一自动切换。研发系统样机并开展试验分析,试验结果表明本系统功能可行有效,可实现避雷器故障检测和自动切换。

关键词：避雷器故障检测自动切换

高层建筑上部结构施工对邻近软土隧道影响的数值分析

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

地基处理 2024年第S1期6卷 67-74页

作者：叶观宝田佳乐史玉金许言张振黄弋烓同济大学土木工程学院地下建筑与工程系上海200092 同济大学岩土及地下工程教育部重点实验室上海200092 上海市地质调查研究院上海200072

已有研究表明,高层建筑从下部至上部的结构施工阶段,以及竣工后运营阶段,都会对邻近的地铁隧道产生影响。然而,目前国内关于高层建筑对邻近隧道影响的研究主要关注下部结构施工阶段,对上部结构施工阶段的研究成果较少。因此,本文针对城... 详细信息

已有研究表明,高层建筑从下部至上部的结构施工阶段,以及竣工后运营阶段,都会对邻近的地铁隧道产生影响。然而,目前国内关于高层建筑对邻近隧道影响的研究主要关注下部结构施工阶段,对上部结构施工阶段的研究成果较少。因此,本文针对城市化进程中高层建筑施工对邻近软土隧道影响的问题展开研究,以上海市某高层商办楼项目为案例,采用Plaxis 3D软件建立三维有限元数值模型,通过现场监测数据验证模型准确性后,分析了坑隧水平间距、坑隧垂直间距和基坑深度对隧道结构内力和变形的影响。研究发现,隧道的最大位移、轨道高差、上下行线差异沉降均会随着坑隧水平间距与隧道中心埋深的增加而减小,随基坑开挖深度的增加变化不明显,3个影响因素对隧道最大弯矩的影响均不明显;此外,3个影响因素对隧道沉降的影响程度相近,但坑隧水平间距为主要影响因素。

关键词：高层建筑上部结构软土盾构隧道数值分析

基于RNA-Seq技术分析经穴推拿对产后大鼠的生物学机制作用

在线全文

学校读者我要写书评

暂无评论

中医康复 2024年第4期1卷 6-10,17页

作者：李可梁笑语李一凡张皓淋官庆烨北京中医药大学北京100029

目的:通过转录组学测序技术(RNA-Seq)探究经穴推拿对产后大鼠基因差异性表达的影响,并分析生物机制特征。方法:采用随机数字表法将6只健康雌性大鼠随机分为空白对照组、经穴推拿组,每组3只,与雄性大鼠合笼交配。经穴推拿组大鼠产后立刻... 详细信息

目的:通过转录组学测序技术(RNA-Seq)探究经穴推拿对产后大鼠基因差异性表达的影响,并分析生物机制特征。方法:采用随机数字表法将6只健康雌性大鼠随机分为空白对照组、经穴推拿组,每组3只,与雄性大鼠合笼交配。经穴推拿组大鼠产后立刻连续推拿干预7天。取大鼠腹主动脉血提取RNA,采用RNA-Seq技术进行转录组学测序,将筛选的差异基因进行GO和KEGG生物信息学分析。结果:经穴推拿组与空白对照组大鼠相比,共959个差异表达基因,其中889个表达上调,70个表达下调。GO分析发现差异基因主要集中在代谢、合成、免疫相关生物学过程,KEGG分析发现差异基因主要参与信号转导、免疫系统、运输和分解通路,并与细胞的生长、分化、衰老与凋亡相关。结论:经穴推拿能够影响产后大鼠的基因表达水平,参与调控产后机体代谢、免疫、细胞衰老进程,为推拿干预产后机能恢复提供了研究基础,有助于未来进一步挖掘经穴推拿促进产后恢复的作用机制。

关键词：产后经穴推拿 RNA测序

在线全文

学校读者我要写书评

暂无评论

广东省产业园区绿色低碳标准体系框架构建

中国标准化 2024年第8期 57-61页

作者：曹佳彦方静叶冠林石永锋杨丽君广东省标准化研究院广东省碳达峰碳中和标准化技术委员会广东擎洲光电科技股份有限公司

产业园区作为区域经济发展的重要引擎,正成为落实“双碳”战略的先行区、示范区和主战场,广东作为中国经济发展的排头兵,拥有众多产业园区,研究构建广东省产业园区绿色低碳标准体系具有重要意义。本文在研究国内外产业园区绿色低碳标准... 详细信息

产业园区作为区域经济发展的重要引擎,正成为落实“双碳”战略的先行区、示范区和主战场,广东作为中国经济发展的排头兵,拥有众多产业园区,研究构建广东省产业园区绿色低碳标准体系具有重要意义。本文在研究国内外产业园区绿色低碳标准化现状的基础上,提出了包括基础通用、规划建设、生产运营和管理评价四大子体系的广东省产业园区绿色低碳标准体系框架。建议在标准体系框架指引下,紧密结合政策、市场和技术发展需求,提出并推动落实重点标准的制修订工作,为广东省产业园区绿色低碳高质量发展提供有力的标准技术支撑。

关键词：产业园区绿色低碳标准体系广东

Crystalline carbon nitride with in-plane built-in electric field accelerates carrier separation for excellent photocatalytic hydrogen evolution

同方期刊数据库博看期刊评论

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2024年第4期35卷 160-165页

作者： Wengao Zeng Yuchen Dong Xiaoyuan ye Ziying Zhang Tuo Zhang Xiangjiu guan Liejin Guo International Research Center for Renewable Energy State Key Laboratory of Multiphase Flow in Power EngineeringXi'an Jiaotong UniversityXi'an 710049China

Achieving a high carrier migration efficiency by constructing built-in electric field is one of the promising approaches for promoting photocatalytic activity. Herein, we have designed a donor-acceptor(D-A) crystalline carbon nitride(APMCN) with 4-amino-2,6-dihydroxypyrimidine(AP) as electron donor, in which the pyrimidine ring was well embedded in the heptazine ring via hydrogen-bonding effect during hydrothermal process. The APMCN shows superior charge-transfer due to giant built-in electric field(5.94times higher than pristine carbon nitride), thereby exhibiting excellent photocatalytic H_(2) evolution rate(1350 μmol/h) with a high AQY(62.8%) at 400 nm. Mechanistic analysis based on detailed experimental investigation together with theoretical analysis reveals that the excellent photocatalytic activity is attributed to the promoted charge separation by the giant internal electric field originated from the D–A structure.

关键词： Crystalline carbon nitride Built-in electric field Donor-acceptor structure Photocatalysis Hydrogen production

Yixin Ningshen Tablet Alleviates Comorbidity of Myocardial Infarction and Depression by Enhancing Myocardial Energy Metabolism and Increasing Availability of Monoamine Neurotransmitter

在线全文

学校读者我要写书评

暂无评论

Chinese Journal of Integrative Medicine 2022年第7期28卷 586-593页

作者： JIANG Bing WU Ruo-ming LI Hai-dong LI Kun LI Hui DANG Wen-zhen FENG Gui-ze BAO Wei-lian ye guan SHEN Xiao-yan Department of Pharmacology School of PharmacyFudan UniversityShanghai 200120China Department of Pharmacology of Chinese Materia Medica School of Traditional Chinese MedicineGuangdong Pharmaceutical UniversityGuangzhou 510006China Central Research Institute Shanghai Pharmaceuticals Holding Co.Ltd.Shanghai 200120China

Objective: To investigate the therapeutic effect of Yixin Ningshen Tablet(YXNS) on comorbidity of myocardial infarction(MI) and depression in rats and explore the underlying mechanism. Methods: The Sprague-Dawley rats were randomly divided into 5 groups with 7 rats in each group according to their weights,including control, model, fluoxetine(FLXT, 10 mg/kg), low-dose YXNS(LYXNS, 100 mg/kg), and high-dose YXNS(HYXNS, 300 mg/kg) groups. All rats were pretreated with corresponding drugs for 12 weeks. The rat model of MI and depression was constructed by ligation of left anterior descending coronary artery and chronic mild stress stimulation. The echocardiography, sucrose preference test, open field test, and forced swim test were performed. Myocardial infarction(MI) area and myocardial apoptosis was also detected. Serum levels of interleukin(IL)-6, IL-1β, tumor necrosis factor-α(TNF-α), 5-hydroxytryptamine(5-HT), adrenocorticotrophic hormone(ACTH), corticosterone(CORT), and norepinephrine(NE) were determined by enzyme linked immunosorbent assay. The proteins of adenosine 5’-monophosphate-activated protein kinase(AMPK), p-AMPK,peroxisome proliferator-activated receptor gamma coactivator-1α(PGC-1α), and nuclear respiratory factor 1(NRF1) in heart were detected by Western blot analysis. The expression levels of TNF-α, IL-6, indoleamine 2,3-dioxygenase(IDO1), kynurenine 3-monooxygenase(KMO), and kynureninase(KYNU) in hippocampus were detected by real-time quantitative polymerase chain reaction. Results: Compared with the model group,the cardiac function of rats treated with YXNS significantly improved(P<0.01). Meanwhile, YXNS effectively reduced MI size and cardiomyocytes apoptosis of rats(P<0.01 or P<0.05), promoted AMPK phosphorylation,and increased PGC-1α protein expression(P<0.01 or P<0.05). HYXNS significantly increased locomotor activity of rats, decreased the levels of TNF-α, IL-6 and IL-1β, and increased the serum levels of 5-HT, NE, ACTH,and CORT(all P<0.05). More

关键词： Yixin Ningshen Tablet depression cardiovascular disorders inflammatory factor monoamine neurotransmitter kynurenine pathway Chinese medicine